Madonna surprised her son Rocco as he turned nine years old on Tuesday (11Aug09) - by urging the 50,000-strong crowd at her show in Denmark to sing Happy Birthday to him.

The Holiday hitmaker is currently taking her Sticky + Sweet tour around the globe and the star's clan were in the Scandinavian country when her eldest son, by director Guy Ritchie, celebrated his big day.And during her concert in Copenhagen, Denmark, Madonna halted her set to announce Rocco's ninth birthday to gig-goers - and encouraged the crowd at the Parken Stadium to sing a chorus of Happy Birthday for the delighted youngster.She shouted out, Happy Birthday to my son Rocco, who is watching the show right now and I just want to say that I love you very much. You are a number one son and maybe everyone would like to sing Happy Birthday to him.